The Park Spark Project
The Park Spark project digester can be above-ground or buried underground except for a feeding tube and a hand-crank, so that people can feed the digester and stir the mixture inside, while the methane is piped to a desired location.

As long as people are walking dogs and throwing away their waste, methane will be produced and the flame will burn as an 'Eternal Flame' (shown here as a street lamp)
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